Big Data Buzzwords From A to Z

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The concept of data warehousing, copying data from multiple operational IT systems into a secondary, off-line database for business analytics applications, has been around for about 25 years.

But as data volumes explode, data warehouse systems are rapidly changing. They need to store more data -- and more kinds of data -- making their management a challenge. And where 10 or 20 years ago data might have been copied into a data warehouse system on a weekly or monthly basis, data warehouses today are refreshed far more frequently with some even updated in real time.